What is the relation between the core level and the advanced level?
The core level and the advanced level are compatible. This means that the core level is in general a subset of the advanced level, i.e. all core level entries are also part of the advanced level with identical titles and scope. However, some exceptions are possible with respect to amendments and to references. Amendments Some revision projects of the advanced level may require amendments to classification places which are part of both the advanced and the core levels (e.g. main groups). Since the revision cycles of the advanced level are much shorter than those of the core level (three months rather than three years), it is possible that such amendments are adopted during the advanced level revision and enter into force for the advanced level. They will then temporarily be part of the advanced level only and will become part of the core level with the next core edition. Similarly, amendments to the core level adopted by the Committee of Experts will temporarily be included in the advan
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